Of course I am making an enormous generalisation and am aware of counter examples. But I still stand by my statement.
In the end I just think that in general, submissions can be neutralised more easily than other facets of fighting. Especially submissions from systems that still place a high focus on the bottom position like BJJ.
I don't entirely agree. I think certain forms of grappling, such as American folk-wrestling, and really, freestyle wrestling, even under the current rules, provide people with powerful tools to use on the ground, but those tools aren't acquired easily or quickly and they aren't necessarily implemented easily either, i.e., they require a high level of exertion .
But I think for the person that doesn't come from one of those sorts of backgrounds, who is not sufficiently skilled in the art of submission grappling, is probably going to be at his worst dealing with submissions. To some extent, striking and wrestling are intuitive; almost everyone knows how to them on some level, because everyone understands grabbing someone and controlling them or hitting or kicking someone. Submission-grappling is the one class of martial arts where that basic combat intuition isn't present. Someone can be a great natural athlete or even a skilled striker or wrestler, but ignorance of submission-grappling can leave him totally helpless to it. I can think of many times in competition, for example, where--this was prior to the leglock boom--people who had far superior wrestling credentials to me fell prey to leglock entries and finishes largely because they just didn't understand what I was doing let alone how to defend against it.
I can think of a kid I used to instruct, who was a collegiate wrestler and a very tough guy, great hip pressure, strong control, who seemed to be on the cusp of getting into the UFC, who has been caught a few times by submissions and I think it was an instance of a guy who was high-level in many ways, in his wrestling and maybe to some extent striking as well, but is a neophyte in many aspects of grappling and thus essentially helpless to certain attacks, because he just doesn't understand them. I couldn't convince him of the importance of really embracing the grappling game instead of taking a minimalist approach, because most guys he runs into can't punish him for it. But the ones who can are a problem.
Of course, I suppose as a guy that used to coach grappling at a gym that's primary focus was MMA, I might be biased. LOL.